The bikes on the '67 show stand, which were supposed to be '68 models, had the "Dreaded Green Blobs" as part of the abortive attempt to "re-brand" the company. There was so much of a fuss, they retreated, but it took a while for the old Norton script to reappear.
It was my impression that some 50 or so bikes went out of the Plumstead works with the Green Blob "badge", but they may have been retrofitted by recall notice. I didn't keep in touch with the Commando after the bike became a Plumstead production program - too busy with the AJS Stormer and plans to emigrate.
Most, if not all of the development of the Commando was done by the engineering team at Marston Road after the formation of Norton Villiers. I joined the company in Feb '67 and it was in full swing then. Bob Trigg ran the team, and the two prototypes were already up and running. The final styling was in work, also in Trigg's group. It was a rush to get the bikes on the stand for the '67 show. and I don't think either of them were runners until a couple of months later.